How do services know a number is VOIP?

They run a line-type lookup against carrier databases, which return whether a number is mobile, landline, or VOIP. Services reject the VOIP result. Our numbers return as real mobile lines.

Are these numbers shared with other users?

No. A short-term verification number is used for your single code, and a rental is reserved exclusively to you for the whole term. They are not recycled public numbers.

Which services work with non-VOIP numbers?

100+ services, including the strict ones that block VOIP outright — WhatsApp, Google, Coinbase, and more. See the full catalog on the services page.

Non-VOIP verification

Non-VOIP SMS verification that actually passes

Most “online numbers” fail at signup because the service detects they are VOIP — short for Voice over Internet Protocol, a number that runs over the internet instead of a cellular network. Fetch SMS issues numbers from real US mobile carriers, so they clear the same checks an everyday phone would.

See supported services

What “non-VOIP” means

What a service checks is the number’s line type — recorded in carrier databases as mobile, landline, or VOIP — which it can look up in milliseconds before deciding whether to send a code.

Services that care about fake accounts (messaging apps, banks, marketplaces) reject line types they associate with throwaway numbers. VOIP is the first thing they filter. A non-VOIP number is one registered to a real mobile carrier, which is what those checks are looking for.

Why VOIP numbers get rejected

It is not about the number looking valid — a VOIP number is a real, dialable US number. The rejection happens at the line-type lookup: the service queries the number, sees VOIP, and refuses to send the code (or sends it and blocks the account later).

Data-center and VOIP ranges are flagged automatically.
Numbers that have signed up before get rate-limited or blocked.
Free SMS-receive sites recycle the same public numbers, so the codes are already burned.

How Fetch SMS clears the check

Every number we issue is a genuine US mobile-carrier line, not VOIP and not a recycled public number. The inbound SMS arrives within seconds and appears in your dashboard and over the API in real time.

You only pay when a code actually arrives: if a short-term verification ends without one, the charge is credited straight back to your wallet.

Frequently asked questions

How do services know a number is VOIP?: They run a line-type lookup against carrier databases, which return whether a number is mobile, landline, or VOIP. Services reject the VOIP result. Our numbers return as real mobile lines.
Are these numbers shared with other users?: No. A short-term verification number is used for your single code, and a rental is reserved exclusively to you for the whole term. They are not recycled public numbers.
Which services work with non-VOIP numbers?: 100+ services, including the strict ones that block VOIP outright — WhatsApp, Google, Coinbase, and more. See the full catalog on the services page.